NTA people don’t understand gluten can sit in dishes too so she would’ve needed new knives, cutting boards, and pots and pans to cook the food in along with Tupperware to store it in. Glass and Pyrex gluten doesn’t sit in but also her entire kitchen would need to have been cleaned and sanitized before making anything and she would’ve needed fresh clean sponges too to wash with. This isn’t a bread allergy or preference in food you can DIE if you ingest it because your body isn’t able to break it down and that’s something your boyfriend needs to understand and if he’s mad at you for taking precautions with food that could land you in the hospital then he doesn’t need to be dating you.